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Rational row reduction: pivot column traversal · case 02
The exact rational row reduction result violates the stated contract at pivot column traversal.
Case contract
Input nonempty rectangular integer matrix; return RREF with each rational entry [p,q].
Why this case matters
Exact discrete arithmetic with observable algorithmic state; no floating point approximation is used.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| explicit oracle 0 | [[[0, 1], [-1, 1]]] | [[[0, 1], [1, 1]]] | Failed |
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